SPC MD 1645



MD 1645 CONCERNING FREEZING RAIN FOR CENTRAL AND SOUTHERN INDIANA…FAR SOUTHEAST ILLINOIS…SOUTHWEST OHIO…NORTHERN KENTUCKY

MD 1645 Image

Mesoscale Discussion 1645
NWS Storm Prediction Center Norman OK
0603 PM CST Wed Nov 14 2018

Areas affected...Central and southern Indiana...far southeast
Illinois...southwest Ohio...northern Kentucky

Concerning...Freezing rain 

Valid 150003Z - 150600Z

SUMMARY...Current mix of freezing rain and sleet is expected to
transition to more of a freezing rain threat into the evening hours.
Accumulations of up to few hundredths of an inch/hr are possible.

DISCUSSION...A 500 mb cut-off low, accompanied by an 850 mb low and
associated strong low-level WAA are bringing moderate to heavy
precipitation to the Ohio and Tennessee Valleys. Much of the
troposphere is below freezing across the Ohio Valley, with surface
temperatures continuing to drop below freezing. At 850 mb, WAA has
overlapped some CAA at 925 mb, prompting some moderate sleet, as has
been recently observed in portions of southern Indiana. Still, with
up to 2-3 C/hr 850 mb WAA expected across the area (per latest RAP
indications) atop a surface that continues to cool below 0C,
freezing rain accumulation rates of up to 0.01-0.04 inches/hr can be
expected (with several areas along the Indiana/Kentucky border
already reporting glazing upon elevated surfaces). A few higher
freezing rain accumulation rates may be observed later in the
evening in heavier rain bands that overlap surfaces that are well
below freezing.

..Squitieri.. 11/15/2018

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...RLX...JKL...ILN...LMK...IND...PAH...ILX...

LAT...LON   37528892 38688817 39358769 40118617 39678354 39138312
            38578294 37528522 36728807 37528892 

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